Revert "[deps] remove the dep on the google/file.dart repo"

This reverts commit fca6949.

Reason for revert: this CL broke the HHH bot and golem

Original change's description:
> [deps] remove the dep on the google/file.dart repo
>
> Change-Id: I2fdca859906a4c6d7713cde1131ead77b4230750
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/389405
> Reviewed-by: Nate Bosch <[email protected]>
> Commit-Queue: Devon Carew <[email protected]>

Change-Id: Ic3e869a867508a984ad44bbb8455dafd11804125
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/389881
Commit-Queue: Nate Bosch <[email protected]>
Reviewed-by: Nate Bosch <[email protected]>
Bot-Commit: Rubber Stamper <[email protected]>
Auto-Submit: Devon Carew <[email protected]>

Author: devoncarew

DEPS

@@ -146,6 +146,7 @@ vars = {
   "dart_style_rev": "5d35f4d829ffb8532d345d95d3e9504ae6cd839e", # disable tools/rev_sdk_deps.dart
   "dartdoc_rev": "80c6f18f34b387d4b9ce89ddd2e3049093335f9d",
   "ecosystem_rev": "2d58550f9e3fd8ecbc3b2e4444095fcb204a66c6",
+  "file_rev": "6842feaef1c4e06239bd30f8d3ef722838b1c97e",
   "fixnum_rev": "83293b8ed86ccd574a94fcf4a2da43f31c1b43e0",
   "flute_rev": "a531c96a8b43d015c6bfbbfe3ab54867b0763b8b",
   "glob_rev": "00a9c82d31c01ae88ec9ae4021d842e9b832aa52",
@@ -421,6 +422,9 @@ deps = {
     "url": Var("dart_git") + "flute.git" + "@" + Var("flute_rev"),
     "condition": "checkout_flute",
   },
+  Var("dart_root") + "/third_party/pkg/file":
+      Var("dart_git") + "external/github.com/google/file.dart"
+      + "@" + Var("file_rev"),
   Var("dart_root") + "/third_party/pkg/glob":
       Var("dart_git") + "glob.git" + "@" + Var("glob_rev"),
   Var("dart_root") + "/third_party/pkg/html":

tools/generate_package_config.dart

@@ -9,9 +9,7 @@ import 'dart:convert';
 import 'dart:io';
 
 // Important! Do not add package: imports to this file.
-//
 // Do not add relative deps for libraries that themselves use package deps.
-//
 // This tool runs before the .dart_tool/package_config.json file is created, so
 // can not itself use package references.
 
@@ -90,6 +88,14 @@ void main(List<String> args) {
   ];
   packages.sort((a, b) => a.name.compareTo(b.name));
 
+  // TODO(devoncarew): Temporarily ignore the second package:file and
+  // package:file_testing locations.
+  packages.removeWhere((p) {
+    final path = posix(p.rootUri);
+    return path == 'third_party/pkg/file/packages/file' ||
+        path == 'third_party/pkg/file/packages/file_testing';
+  });
+
   // Remove any packages with identical names.
   final uniqueNames = packages.map((p) => p.name).toSet();
 

tools/package_deps/bin/package_deps.dart

@@ -453,6 +453,8 @@ class SdkDeps {
     _findPackages(Directory('pkg'));
     _findPackages(Directory(path.join('third_party', 'devtools')));
     _findPackages(Directory(path.join('third_party', 'pkg')));
+    _findPackages(
+        Directory(path.join('third_party', 'pkg', 'file', 'packages')));
 
     if (verbose) {
       print('Package versions in the SDK:');